Stalling?

[MINIz guy]

There is no engine malfunction light, there is no tough starting like the fuel pump issue. We're just backing out slowly, <5MPH and the engine will just quit. No messages pop up, it just becomes silent. iDrive is still up, and it will restart perfectly fine, as if nothing ever happened. We haven't been able to purposely duplicate the issue, but it will just happen out of the blue. It won't stall in a parking lot, when warmed up or when driving regularly. It will just happen around the same place of our driveway, without any prior notification of something wrong. It has happened twice to my mom by herself, and it just happened with me in the car today at 11AM.

Is odd part is that it leaves no messages. It is basically untraceable, since it is hard to purposely duplicate. Maybe we will have to film every time we reverse out, and hopefully it once on camera to prove to our SA.